CVE-2026-64438 (GCVE-0-2026-64438)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-07-27 05:00
VLAI
Title
crypto: qat - fix VF2PF work teardown race in adf_disable_sriov()
Summary
In the Linux kernel, the following vulnerability has been resolved: crypto: qat - fix VF2PF work teardown race in adf_disable_sriov() The VF2PF interrupt handler queues PF-side response work that stores a raw pointer to per-VF state (struct adf_accel_vf_info). Currently, adf_disable_sriov() destroys per-VF mutexes and frees vf_info without stopping new VF2PF work or waiting for in-flight workers to complete. A concurrently scheduled or already queued worker can then dereference freed memory. This manifests as a use-after-free when KASAN is enabled: BUG: KASAN: null-ptr-deref in mutex_lock+0x76/0xe0 Write of size 8 at addr 0000000000000260 by task kworker/24:2/... Workqueue: qat_pf2vf_resp_wq adf_iov_send_resp [intel_qat] Call Trace: kasan_report+0x119/0x140 mutex_lock+0x76/0xe0 adf_gen4_pfvf_send+0xd4/0x1f0 [intel_qat] adf_recv_and_handle_vf2pf_msg+0x290/0x360 [intel_qat] adf_iov_send_resp+0x8c/0xe0 [intel_qat] process_one_work+0x6ac/0xfd0 worker_thread+0x4dd/0xd30 kthread+0x326/0x410 ret_from_fork+0x33b/0x670 Add a PF-local flag, vf2pf_disabled, that gates work queueing, worker processing, and interrupt re-enabling during teardown. Set this flag atomically with the hardware interrupt mask inside adf_disable_all_vf2pf_interrupts(). After masking, synchronize the AE cluster MSI-X interrupt and flush the PF response workqueue before tearing down per-VF locks and state so all in-flight work completes before vf_info is destroyed. Introduce adf_enable_all_vf2pf_interrupts() to clear the flag and unmask all VF2PF interrupts under the same lock when SR-IOV is re-enabled. This ensures the software flag and hardware state transition atomically on both the enable and disable paths.
Severity
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ed8ccaef52fa03fb03cff45b380f72c9f869f273 , < 218c2836b3987f3fa1d9eac505462cded0821e4c (git)
Affected: ed8ccaef52fa03fb03cff45b380f72c9f869f273 , < 446b4d77599cf1a168573f7fb32a4a6aa4f09219 (git)
Affected: ed8ccaef52fa03fb03cff45b380f72c9f869f273 , < 5d916c1eae1933511a69bffe243b4ee5d7da399c (git)
Affected: ed8ccaef52fa03fb03cff45b380f72c9f869f273 , < f344a369d0380d54c8d6c8d24734a78dd5a89817 (git)
Affected: ed8ccaef52fa03fb03cff45b380f72c9f869f273 , < 51144032248cc4ea22917370565650670b8b4e9b (git)
Affected: ed8ccaef52fa03fb03cff45b380f72c9f869f273 , < 49cd5ac6de8de39a14ead609bb552d372d5602cd (git)
Affected: ed8ccaef52fa03fb03cff45b380f72c9f869f273 , < 6e92b28cd74fa433658efeadf21b9d4b01023d7d (git)
Affected: ed8ccaef52fa03fb03cff45b380f72c9f869f273 , < 277281c10c63791067d24d421f7c43a15faa9096 (git)
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Linux Linux Affected: 4.3
Unaffected: 0 , < 4.3 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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        {
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          "product": "Linux",
          "programFiles": [
            "drivers/crypto/intel/qat/qat_common/adf_accel_devices.h",
            "drivers/crypto/intel/qat/qat_common/adf_common_drv.h",
            "drivers/crypto/intel/qat/qat_common/adf_isr.c",
            "drivers/crypto/intel/qat/qat_common/adf_sriov.c"
          ],
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            "drivers/crypto/intel/qat/qat_common/adf_common_drv.h",
            "drivers/crypto/intel/qat/qat_common/adf_isr.c",
            "drivers/crypto/intel/qat/qat_common/adf_sriov.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
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              "version": "6.1.178",
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              "version": "6.18.40",
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            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
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        }
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: qat - fix VF2PF work teardown race in adf_disable_sriov()\n\nThe VF2PF interrupt handler queues PF-side response work that stores a\nraw pointer to per-VF state (struct adf_accel_vf_info). Currently,\nadf_disable_sriov() destroys per-VF mutexes and frees vf_info without\nstopping new VF2PF work or waiting for in-flight workers to complete. A\nconcurrently scheduled or already queued worker can then dereference\nfreed memory.\n\nThis manifests as a use-after-free when KASAN is enabled:\n\n  BUG: KASAN: null-ptr-deref in mutex_lock+0x76/0xe0\n  Write of size 8 at addr 0000000000000260 by task kworker/24:2/...\n  Workqueue: qat_pf2vf_resp_wq adf_iov_send_resp [intel_qat]\n  Call Trace:\n    kasan_report+0x119/0x140\n    mutex_lock+0x76/0xe0\n    adf_gen4_pfvf_send+0xd4/0x1f0 [intel_qat]\n    adf_recv_and_handle_vf2pf_msg+0x290/0x360 [intel_qat]\n    adf_iov_send_resp+0x8c/0xe0 [intel_qat]\n    process_one_work+0x6ac/0xfd0\n    worker_thread+0x4dd/0xd30\n    kthread+0x326/0x410\n    ret_from_fork+0x33b/0x670\n\nAdd a PF-local flag, vf2pf_disabled, that gates work queueing, worker\nprocessing, and interrupt re-enabling during teardown. Set this flag\natomically with the hardware interrupt mask inside\nadf_disable_all_vf2pf_interrupts(). After masking, synchronize the AE\ncluster MSI-X interrupt and flush the PF response workqueue before\ntearing down per-VF locks and state so all in-flight work completes\nbefore vf_info is destroyed.\n\nIntroduce adf_enable_all_vf2pf_interrupts() to clear the flag and\nunmask all VF2PF interrupts under the same lock when SR-IOV is\nre-enabled. This ensures the software flag and hardware state transition\natomically on both the enable and disable paths."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-27T05:00:59.389Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/218c2836b3987f3fa1d9eac505462cded0821e4c"
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        {
          "url": "https://git.kernel.org/stable/c/446b4d77599cf1a168573f7fb32a4a6aa4f09219"
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          "url": "https://git.kernel.org/stable/c/5d916c1eae1933511a69bffe243b4ee5d7da399c"
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        },
        {
          "url": "https://git.kernel.org/stable/c/277281c10c63791067d24d421f7c43a15faa9096"
        }
      ],
      "title": "crypto: qat - fix VF2PF work teardown race in adf_disable_sriov()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64438",
    "datePublished": "2026-07-25T08:51:11.740Z",
    "dateReserved": "2026-07-19T15:36:31.788Z",
    "dateUpdated": "2026-07-27T05:00:59.389Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64438",
      "date": "2026-08-01",
      "epss": "0.00135",
      "percentile": "0.03382"
    },
    "microsoft_vex": {
      "current_release_date": "2026-07-27T14:42:12.000Z",
      "cve": "CVE-2026-64438",
      "id": "msrc_CVE-2026-64438",
      "initial_release_date": "2026-07-26T01:11:26.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "crypto: qat - fix VF2PF work teardown race in adf_disable_sriov()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64438.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64438\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-25T10:17:28.303\",\"lastModified\":\"2026-07-27T05:16:50.363\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncrypto: qat - fix VF2PF work teardown race in adf_disable_sriov()\\n\\nThe VF2PF interrupt handler queues PF-side response work that stores a\\nraw pointer to per-VF state (struct adf_accel_vf_info). Currently,\\nadf_disable_sriov() destroys per-VF mutexes and frees vf_info without\\nstopping new VF2PF work or waiting for in-flight workers to complete. A\\nconcurrently scheduled or already queued worker can then dereference\\nfreed memory.\\n\\nThis manifests as a use-after-free when KASAN is enabled:\\n\\n  BUG: KASAN: null-ptr-deref in mutex_lock+0x76/0xe0\\n  Write of size 8 at addr 0000000000000260 by task kworker/24:2/...\\n  Workqueue: qat_pf2vf_resp_wq adf_iov_send_resp [intel_qat]\\n  Call Trace:\\n    kasan_report+0x119/0x140\\n    mutex_lock+0x76/0xe0\\n    adf_gen4_pfvf_send+0xd4/0x1f0 [intel_qat]\\n    adf_recv_and_handle_vf2pf_msg+0x290/0x360 [intel_qat]\\n    adf_iov_send_resp+0x8c/0xe0 [intel_qat]\\n    process_one_work+0x6ac/0xfd0\\n    worker_thread+0x4dd/0xd30\\n    kthread+0x326/0x410\\n    ret_from_fork+0x33b/0x670\\n\\nAdd a PF-local flag, vf2pf_disabled, that gates work queueing, worker\\nprocessing, and interrupt re-enabling during teardown. Set this flag\\natomically with the hardware interrupt mask inside\\nadf_disable_all_vf2pf_interrupts(). After masking, synchronize the AE\\ncluster MSI-X interrupt and flush the PF response workqueue before\\ntearing down per-VF locks and state so all in-flight work completes\\nbefore vf_info is destroyed.\\n\\nIntroduce adf_enable_all_vf2pf_interrupts() to clear the flag and\\nunmask all VF2PF interrupts under the same lock when SR-IOV is\\nre-enabled. This ensures the software flag and hardware state transition\\natomically on both the enable and disable paths.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/crypto/intel/qat/qat_common/adf_accel_devices.h\",\"drivers/crypto/intel/qat/qat_common/adf_common_drv.h\",\"drivers/crypto/intel/qat/qat_common/adf_isr.c\",\"drivers/crypto/intel/qat/qat_common/adf_sriov.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ed8ccaef52fa03fb03cff45b380f72c9f869f273\",\"lessThan\":\"218c2836b3987f3fa1d9eac505462cded0821e4c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed8ccaef52fa03fb03cff45b380f72c9f869f273\",\"lessThan\":\"446b4d77599cf1a168573f7fb32a4a6aa4f09219\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed8ccaef52fa03fb03cff45b380f72c9f869f273\",\"lessThan\":\"5d916c1eae1933511a69bffe243b4ee5d7da399c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed8ccaef52fa03fb03cff45b380f72c9f869f273\",\"lessThan\":\"f344a369d0380d54c8d6c8d24734a78dd5a89817\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed8ccaef52fa03fb03cff45b380f72c9f869f273\",\"lessThan\":\"51144032248cc4ea22917370565650670b8b4e9b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed8ccaef52fa03fb03cff45b380f72c9f869f273\",\"lessThan\":\"49cd5ac6de8de39a14ead609bb552d372d5602cd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed8ccaef52fa03fb03cff45b380f72c9f869f273\",\"lessThan\":\"6e92b28cd74fa433658efeadf21b9d4b01023d7d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed8ccaef52fa03fb03cff45b380f72c9f869f273\",\"lessThan\":\"277281c10c63791067d24d421f7c43a15faa9096\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/crypto/intel/qat/qat_common/adf_accel_devices.h\",\"drivers/crypto/intel/qat/qat_common/adf_common_drv.h\",\"drivers/crypto/intel/qat/qat_common/adf_isr.c\",\"drivers/crypto/intel/qat/qat_common/adf_sriov.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.3\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.3\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.0,\"impactScore\":6.0}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/218c2836b3987f3fa1d9eac505462cded0821e4c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/277281c10c63791067d24d421f7c43a15faa9096\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/446b4d77599cf1a168573f7fb32a4a6aa4f09219\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/49cd5ac6de8de39a14ead609bb552d372d5602cd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/51144032248cc4ea22917370565650670b8b4e9b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5d916c1eae1933511a69bffe243b4ee5d7da399c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6e92b28cd74fa433658efeadf21b9d4b01023d7d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f344a369d0380d54c8d6c8d24734a78dd5a89817\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T15:59:20Z",
      "cve": "CVE-2026-64438",
      "id": "CVE-2026-64438",
      "initial_release_date": "2026-07-25T15:59:20Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64438",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64438.json",
      "version": "2"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.